Other corporations that have cut ties with the NRA following last week's deadly mass shooting in Parkland, Fla., are Enterprise Holdings (which owns Enterprise, Alamo and National, car rental companies) and First National Bank of Omaha. The bank was the official credit card of the NRA, but it, too, will no longer be associated with the gun rights advocacy group.

NRA Business Alliance members receive up to a 26 percent discount on shipping expenses through FedEx. The company has not commented.